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Finding the Fourth Proportional to 710.15, 979.92 and 395.36

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Solution

The fourth proportional to 710.15, 979.92 and 395.36 is: 545.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.15 : 979.92 = 395.36 : x
  2. Step 2: Convert to fraction form
    710.15/979.92 = 395.36/x
  3. Step 3: Cross multiply
    710.15x = 979.92 × 395.36
  4. Step 4: Simplify right side
    710.15x = 387,416.27
  5. Step 5: Solve for x
    x = 387,416.27/710.15
  6. Step 6: Final answer
    x = 545.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.